Improvement in car-springs



A. MIDDLETON", 1r.

Gar-Springs.

NO.138,675. V Patented May 6,1873.

WITNESSES. a, L2, aw.

AM PHom-mmsRAPmcco.ufloseamvzlspnocssg) UNITED STATES PATENT QFFIGE.

ALLEN MIDDLETON, JR, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN CAR-SPRINGS.

Specification forming part of Letters Patent No- 13S,675, dated May 6,1873; application filtd November 27, 1872.

To all whom it may concern:

Be it known that I, ALLEN MIDDLETON, Jr., of Philadelphia, Pennsylvania,have invented an Improvement in Oar-Springs, of which the following is aspecification:

My invention relates to an improvement in the car-spring for whichLetters Patent No. 38,255 were granted to J. E. Wooten, April 21, 1863;and the object of my invention is to render the said spring more rigidand compact, and more available as a draw and bumper spring than thatdescribed in said patent.

I attain this object by confining spiral springs D between two plates AA, by means of lesser internal springs B, which are simply screwed intothe said plates, as shown in the vertical section, Figure 1, and whichform part of the elastic medium of the spring.

The aforesaid car-spring-of J. E. Wooten consists simply of two platesconnected together bya number of precisely similar sprin gs, which formthe whole elastic medium, and which are screwed into the plates. In thisinvention it was necessary to employ comparatively small spirals, and toarrange them at a sufficient distance apart to prevent the weakening ofthe plates by holes arranged too close to each other; hence the desiredrigidity could not be obtained in a car-spring of the required moderatebulk, a defect which my invention has been designed to obviate.

The smaller spirals, which are contained within those of largerdiameter, (see sectional plan, Fig. 2,) are adapted to internal spiralgrooves formed in orifices in the plates, and are so adjusted as tocause the plates to simply bear against the opposite ends of the largerspirals, which are retained in their proper lateral position by annularprojections 00 surrounding the orifices for receiving the 'endsof thesmaller spirals, and serving to strengthen the plates as well as toinsure a better hold of the spirals on the said plates.

An important feature of the spring is its freedom from all externalprojections, such as bolt-heads, the exterior of the plates beingperfectly flat; hence the springs are especially available as draw andbumper springs.

I claim as my invention-- 7 1. A car-spring in which large spirals Dareconfined between plates A A, connected together by small spirals B, allcombined to opcrate substantially as and for the purpose set forth.

2. The plate A, having the annular projections as threaded internally,and surrounding the small spirals and retaining the large spirals intheir proper lateral position.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

ALLEN MIDDLETON, JR.

Witnesses WM. A. STEEL, HUBERT HowsoN.

